Rutherfordium
Isotopes

Isotope
Half-life
Decay mode
Discovery year
Reaction
253Rf
48 μs
α, SF
1994
204Pb(50Ti,n)
254Rf
23 μs
SF
1994
206Pb(50Ti,2n)
255Rf
2.3 s
ε?, α, SF
1974
207Pb(50Ti,2n)
256Rf
6.4 ms
α, SF
1974
208Pb(50Ti,2n)
257Rf
4.7 s
ε, α, SF
1969
249Cf(12C,4n)
257mRf
4.1 s
ε, α, SF
1969
249Cf(12C,4n)
258Rf
14.7 ms
α, SF
1969
249Cf(13C,4n)
259Rf
3.2 s
α, SF
1969
249Cf(13C,3n)
259mRf
2.5 s
ε
1969
249Cf(13C,3n)
260Rf
21 ms
α, SF
1969
248Cm(16O,4n)
261Rf
78 s
α, SF
1970
248Cm(18O,5n)
261mRf
4 s
ε, α, SF
2001
244Pu(22Ne,5n)
262Rf
2.3 s
α, SF
1996
244Pu(22Ne,4n)
263Rf
15 min
α, SF
1999
263Db( e−, ν e)
263mRf ?
8 s
α, SF
1999
263Db( e−, ν e)
265Rf
1.1 min
SF
2010
269Sg(—,α)
266Rf
23 s?
SF
2007?
266Db( e−, ν e)?
267Rf
1.3 h
SF
2004
271Sg(—,α)
268Rf
1.4 s?
SF
2004?
268Db( e−, ν e)?
270Rf
20 ms?
SF
2010?
270Db( e−, ν e)?

Question: Which isotope has been reported?
Answer: Sixteen different isotopes have been reported with atomic masses from 253 to 270 (with the exceptions of 264 and 269).